Fitment with K&N 57 series/unexpected mpg gain
Reviewed By Kyle S (DUDLEY, NC) Reviewed for a
—9/17/2014 12:11 PM
08 F150 SuperCrew 4x4 5.4L stock with K&N 57 series intake. Had to rig the installation a little since I have a K&N intake that puts an elbow between the TB and the manifold. I still installed it on top of the manifold rather than directly behind the TB bacause there is a corkscrew lip that goes down into the manifold a bit. If installed behind the TB the lip would potrude into the elbow and actually disrupt proper airflow. I also had to use different length bolts than the ones supplied because they are for stock application. Before install I drove very conservatively for 1 tank in town and then again only Highway at 75 mph, both with 93 octane. In town I saw 12.5 mpg and HWY I saw 15.9 mpg. After install I drove the same test and saw 13.5 in town and 17.1 HWY. I did not expect to see any gains without having it programmed so I was surprised to even see 1 mpg. No difference in felt power or acceleration so dont get excited there. Good product, a little pricey, but it does in fact help. Just dont expect to see the 4 mpg change they advertise unless you have an intake, exhaust, and custom tune for your specific setup (if you don't often purchase aftermarket items, thats where they trick you with the numbers and use the words "up to" meaning you could possibly see said gains in perfect conditions on a slight downhill with other complimenting aftermarket parts). But once you have all the right peices, they work together nicely and you will see that 4 mpg gain.